Color-Changing Shoelaces

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Ive used this great trick hundreds of times, and it never fails to get a
good reaction from kid-show audiences.

I was going to wear my tennis shoes
today, but last night I put them in the washer to get them clean and I poured
in a little Jog detergent.
Jogits like Dash, but slower.
Anyway, I got my
shoes clean, and then I put them in the dryer. And when I opened the dryer
door this morning, I discovered that they had melted!
And I was just left
with this blue shoelace.
Kids tell you that its white. Hmmm. Must have
used too much bleach!
Well, it was a blue shoelace. Run the white shoelace
through your hand and it changes to blue. The audience reacts favorably until its
obvious youre concealing something in your hand. Now, I know what youre
thinking, you say, and as you open your hand, a red shoelace tumbles out!
But the white shoelace is right over here. Reaching into your pocket, you
remove the white shoelace.